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I H. w. YOUNGQUIST. 7 CAM'ACTUATED WARP TENSION CONTROLLING MECHANISM FOR LOOM S.

APPLICATION FiLED SEPT. 85 1920.

Patented Sept. 27, 192 1 jAlTys.

\HVBHTOT. Henry W.Youngq;uisT

UNITED STATESJ'PATENT OFFICE.

'H NRY W. YoUNGQnIsrr, or MANCHESTER, HAMPSHI E, ASSIGNOR, To mmrnn oonron n'rioiv, or nornnnnn, MASSACHUSETTS, AcoRrQ 0F MAINE.

CAM-ACTUATED wnRr-rEnsIoN ooNTRoLLINGMEoHANIsM FOR LOOMS.

To all whom it may conc ermf Be it known that I, HENRY YOUNG-- QUIST, a citizen of the United States, and

resident of Manchester, county of Hills borough, State of New Hampshire, have invented anflmprovement in Cam-Actuated VVarp-Tension-Controlling Mechanismfor Looms, of which the following description, in connection with-the accompanying drawing, is a specification, like characters on the drawing representing like parts. I v

This invention relates to'improvements in warp tensionj controlling mechanism for looms and the objectthereof is to provide novel means whereby a substantially constant tension may be imposed'upon the warp, with means for locking thetension, apply-' ing means at predetermined intervals in the operation of the loom, preferably just before the reed upon the lay engages the fell of the web of the cloth being woven.

More specifically thisinvention comprises a modified form of the invention more fully disclosed in my co-pending application, Se-' rial Number 409,000 filed September 8, 1920.

A further object of the invention is to provide a mechanism of the character specified which is operable from the cam shaft ofthe loom. V i A further object ofthe invention is to provide a novelform of brake for the warp beamcomprising separable sections which can be disengaged to permit the removal'of the warp beam without modificationof the adjustment of the mechanism for imposing tension upon the brake;

Other ob 'ects and features of the invention will more fully appear from the fellows ing description and accompanying draw ngs, and will be pointed out in'the annexed claims. 1

In the drawings, Figure 1 is a side eleva tion of a sufiicient portion ofa loom to illustrate my invention applied thereto. I

- Fig. 2 is a detail plan View of an end portion of the loom side and cross girder show ing the means by which the lever mechanism for operating the brake is supported. V

Fig. 3 is a detail planview of the inter looking ends of the brake illustrated in ig. 4 is a detail view of a portion of the end of the warp beam. and the brake drum showing the-brake in section.

13 with the lever14.

f Specification of Letters Patent. Patented S t 27 1921 Application filed September 8, 1920.

Serial Nb; 408,999.

The invention is illustrated herein as applied to'a loomof the well known Northrop type, and inasmuch asthe loom may comprise the usual mechanisms only the end portion of one of the loom sides, the warp beam, the cam shaft and a portion of the cross girder connecting the loom sides, is illustratedherein. It will, however, be under stood that the invention may be incorporated in other looms within the spirit and scope of the claims herein.

In the mechanism disclosed herein the warp-beam l is provided with the usual shaft 2 which is suitably mounted in open bearings 3 in'the loom side, and is provided with'a brake drum 4. The brake which cooperates with the drum may be of any suitable type adapted to perform the functions herein described, but preferably consists of a strap 5 having attached thereto a series of brake shoes 6which engage the periphery of the drum, one endof the strap 5 being attached 'to a hook- 7-which is secured to a bracket'Suponthe cross girder 9 of the loom frame. The other end of the brake strap is connected to the arm 10 of a rock shaft p hich is operable from the cam shaft of the 00m. As illustrated herein the arm 10 is fixedly secured to a rock shaft 11 mounted in a suit-- usual'cam shaft 16 of the'loom. A spring 17 which is interposedbetween the boss 13 on the arm 12 and the lever 14 servesto cushion the shocks caused by engagement of the cam Asillustrated herein the cam 15 is provided with twoxlobeswhich alternately engage the'end of thelever 14 thereby actuating'the lever and causing it to exertsuch tension upon the brake band as to lock the warp .beam temporarily. against rotation twice for every rotation of the camshaft. Inasmuch as the lay is reciprocated twice for every rotation of the cam shaft in this type of loom, the warp beam will be looked upon each reciprocation of the lay and the cams preferably are so placed upon the cam shaft that this locking action will take place when the lay is approximately at the end of its beating up movement and the reed in close proximity to the tell of the cloth, as is more fully described in my co-pending application.

In the operation of the loom a normal light tension is maintained upon the warp and this is conveniently accomplished by means bearing upon the brake lever with a predetermined pressure which desirably is made adjustable in order that a substantially constant tension may be maintained upon the warp as the diameter of the warp beam decreases during the operation of the loom. In the preferred construction as disclosed herein the means for thus applying. pressure to the brake lever comprises a screw 18 which is adjustably mounted in a retainer 19 which is pivotally mounted upon a stud 20 in a bracket 21 upon the loom side. The

bracket 21 is desirably an L-shaped form, the upper wall 22 overlying the retainer 19 in such a manner as to prevent upward movement of the retainer the vertical wall thereof limiting the lateral movement of the retainer 19 to position the end of the adjusting screw 18 directly over the lever 14. Any suitable means may be provided for locking the retainer 19in operative position. As illustrated herein a pin 24 is inserted in a suitable aperture extending through the up per wall 22 of the L-shaped bracket 21.

As before stated the brake preferably is formed in two sections which may be separated to permit the removal of the warp beam. In the construction herein illustrated, one of the brake shoes 6 is formed of two sections 25 and 26 having complementary Lshaped extensions 27 and 28 which may be easily interlocked as the brake is applied to the drum and which when in operative position upon the drum will be held in an interlocked position by the end disk 29 of the warp beam and flange 30 upo the brake drum.

In order to enable the brake sections to be assembled and separated it is necessary that the brake should be slackened enough to permit the engagement and disengage ment of the interlocking ends of the brake sections, and this is accomplished by removing the pin 24 from the bracket 21 and swinging aside the retainer 19 sufliciently to permit the lever 14 to be raised.

In the operation of the loom the screw 18 is so adjusted as to apply a suflicient pressure to the brake lever 14 to maintain the desired tension upon the warp. As the cam shaft 16 rotates the lobes of the cam 15 engage the end of the lever 14 and by depressing it apply the brake to the drum with such force as to lock the warp beam against rotation. This action occurs when the reed upon the lay is about to engage the fell of the cloth and continues until the beat-up action is completed. As the lay recedes from the fell of the cloth the lobe of the cam 15 passes out of engagement with the lever 14, thus releasing the locking mechanism and restoring upon the warp, the normal predetermined tension.

When it is desired to remove or replace the warp beam the retainer 19 is swung aside out of the path of the lever 14 so that said lever may be raised sufliciently to permit the interlocking ends of the brake to be separated to disengage it from the brake drum. After the warp beam has been removed and replaced by a new beam the ends of the brake section may be againinterlocked and when the lever isdepressed and the retainer restored to its operative position the warp will be drawn from the beam under.

the same tension as that which was applied to the tension upon the previous warp beam.

By reason of this construction the weaver is also enabled to release thetension upon the warp when it becomes necessary to take out a section of filling on account of improper weaving and at any other time it may be desirable.

The construction embodying my invention also prevents breakage of the warp by misplaced shuttles, for if a shuttle stops before entering the shuttle box or rebounds from the shuttle box into the shed the normal light pressure of the brake upon the drum Wlll permit the warp beam to rotate sufiiciently under the pull of the warp engaged by the shuttle to prevent the warp from snapping when the tension locking means becomes effective at the end of the beat-up of the lay. v It will be understood that the embodiment of the invention disclosed herein is illustrative and not restrictive, and that various modifications in construction and arrangement of parts may be made within the spirit and scope of the'tollowing claims.

Having thus described my invention, what I claim as new and desired to obtain by Letters Patent, is: 1

1. A warp tension controlling mechanism for looms having a cam shaft comprising a warp beam having a brake drum thereon, a brake engaging. said drum, brake applying means acting normally to maintain a substantially uniform tension upon the warp ated arm, ayielding connection between said lever and said actuating arm, a cam upon the cam shaft of the loom for actuating said lever to increase the tension upon the warp at predetermined intervals in the operation of the loom and adjustable means engaging said lever operating to maintain a predetermined normal tension upon the warp.

3. Warp tension controlling mechanism for looms comprising a warp beam having a brake drum thereon, a brake engaging said brake drum consisting of a plurality of flexibly connected brake shoes, one of said shoes being constructed in detachably interlocking sections, means for anchoring one end of said brake and releasable means for applying tension to the other end of said brake whereby the releasing of said tension a plying means will permit disengagement 0 said brake shoes and removal of the warp beam.

4. Warp tension controlling mechanism for looms comprising a warp beam having a brake drum thereon, a brake embracing said drum rigidly anchored at one end, a lever connected to the other end of said brake having a memberextending adjacent to the cam shaft of the loom, a cam on said cam shaft operable intermittently to engage the end of said lever, and adjustable means secured to said loom side detachably engaging said lever and normally acting to maintain a predetermined tension upon said brake.

5. Warp tension controlling mechanism for looms com rising a warp beam having a brake drum t ereon, a separable brake embracing said drum rigidly anchored at one end, a lever connected to the other end of said brake having a member extending adjacent to the cam shaft of the loom, a cam on said cam shaft operable intermittently to engage the end of said lever, and adjustable means pivotally mounted on said loom side detachably engaging said lever and normally acting to maintain a predetermined tension upon said brake but capable of removal from engagement with said lever without varying the adjustment thereof.

6. Warp tension controlling mechanism for looms. comprising a warp beam having a brake drum thereon, a brake embracing said drum rigidly anchored at one end, a lever connected to the other end of said brake having a member extending adjacent to the cam shaft of the loom, a cam on said cam shaft operable intermittently to engage the end of said lever, and adjustable means secured to said loom side engaging said lever and normally acting to maintain a predetermined tension upon said brake, a retainer pivotally mounted upon the loom side, a screw carried by said retainer engaging said lever, capable of adjustment for varying the pressure on said lever and thereby the tension upon said brake band and locking means for said retainer operable to retain the same in normal position or to permit the retainer to be swung aside out of the path of said lever.

In testimony whereof, I have signed my name to this specification.

HENRY W. YOUNGQUIST. 

